CN105061806B - A kind of recovery process of ultra-high molecular weight polyethylene discarded object - Google Patents

A kind of recovery process of ultra-high molecular weight polyethylene discarded object Download PDF

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CN105061806B
CN105061806B CN201510433400.6A CN201510433400A CN105061806B CN 105061806 B CN105061806 B CN 105061806B CN 201510433400 A CN201510433400 A CN 201510433400A CN 105061806 B CN105061806 B CN 105061806B
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molecular weight
weight polyethylene
ultra
extruder
screw
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CN201510433400.6A
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CN105061806A (en
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雷华
文韵豪
李振华
鲁阳
陈建党
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浦江县金鑫废旧物资回收有限公司
浙江大学
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Abstract

The invention discloses a kind of recovery process of ultra-high molecular weight polyethylene discarded object, ultra-high molecular weight polyethylene discarded object adds extruder after crushed, and under high temperature and alternating shear effect, depolymerization occurs, realizes and recycles;The extrusion temperature of the extruder is 240~300 DEG C, and die pressure is 3~20MPa;The draw ratio of the extruder screw is 56~80, and screw speed is 400~1200rpm so that the cutter shearing line speed that material is born>4m/s;It is 2~10 that the screw combinations of the extruder, which keep the alternating cycles of shearing force,;The processing time of the material>30s;Described extruder is single screw extrusion machine or double screw extruder.Recovery process provided by the invention can degrade ultra-high molecular weight polyethylene with environment-friendly high-efficiency so that the polyethylene discarded object after degraded has temperature flowing and machinability, can be granulated by Screw Extrusion, directly applies to the production of articles in downstream.

Description

A kind of recovery process of ultra-high molecular weight polyethylene discarded object

Technical field

The present invention relates to the recovery of polymeric scrap material, regeneration field, more particularly to a kind of ultra-high molecular weight polyethylene The recovery process of discarded object.

Background technology

Superhigh molecular weight polyethylene material, the polyethylene that weight average molecular weight is more than more than 1,000,000 is typically referred to, due to molecule Amount is big, and intensity, rigidity and the modulus of material are all very high, and has superpower wearability, self lubricity, chemical property stabilization, Ageing resistace is strong.Due to these features, the pipeline of wear-resisting high-strength degree, the various container storage tanks in mining industry can be prepared into (such as trailer, feed bin, chute), various high-strength and high-modulus chemical fibres, is made various civilian or military rope, flak jackets, shield etc., with And various sports goods and sports equipment etc..Ultra-high molecular weight polyethylene widely uses, and inevitably results from substantial amounts of Discarded object, and these discarded objects are to classify and individualism well a bit, some do not classify well then and with it is common Polyethylene is mixed in together, and these ultra-high molecular weight polyethylenes mixed in together are difficult to be separated, therefore in recovery profit Used time can only recycle together with common polythene.But in this removal process, the problem of processing just occurs:It is because super The molecular weight of High molecular weight polyethylene is huge, does not have shear flow at high temperature, therefore in various screw extruders or injection In machine, ultra-high molecular weight polyethylene all shows non-fusible, it is difficult to be molded with the machining process of routine, super high molecular weight gathers The processing method of ethene is typically compacting-sinter molding, is prepared into tubing, sheet material, tubing or bar, then cuts, welds again Variously-shaped product is prepared into, or passes through gel or plasticising spinning mode spinning.Therefore for ultra-high molecular weight polyethylene Discarded object or common polythene discarded object containing ultra-high molecular weight polyethylene, it is to realize to be granulated by Screw Extrusion , particularly those common polythene discarded objects for containing ultra-high molecular weight polyethylene, the super high molecular weight of content superelevation 5% are gathered Ethene, then machine-shaping is unable to substantially, these infusible ultra-high molecular weight polyethylenes will be the die head and filter screen of extruder Block, therefore doing of still not had of the recycling for the common polythene discarded object containing ultra-high molecular weight polyethylene Method, only way are to dilute these materials, reduce the content of ultra-high molecular weight polyethylene, although can be so granulated, But super high molecular weight with which, due to non-fusible, it is a kind of filler in the material, and it is bulk in the base In the presence of can form stress concentration and weak link, the mechanical property of material is greatly reduced.Therefore effective place must be found Reason method, it is the performance that these super high molecular weights do not interfere with material, greatly improves the recovery value of material.

The difficult of ultra-high molecular weight polyethylene is processed, molecular chain length huge just because of its molecular weight, the phase between strand Mutually winding is complicated, forms the space network of similar cross-linked polymeric, therefore, it is difficult to flow.Naturally, superelevation point is realized The recovery of sub- weight northylen discarded object, this complicated winding arrangement is destroyed, long-chain molecule chain is shortened, turns into conventional molecular weight and gathers Ethene, thus solves unmanageable problem in removal process with machinability.

The destruction of long-chain chemical bond has two methods, i.e. chemical method and physical method.Chemical method is helped using chemistry Agent, at high temperature, attack destruction is carried out to molecular link by these auxiliary agents so that chemical bond disconnects, while these materials can also The active chain end of disconnection is carried out inertia end seal, the chemical bond avoided damage to is crosslinked again, such ultra-high molecular weight polyethylene Long-chain molecule chain shortens, and so as to have shear flow and processability, can be recycled as thermoplastic polyethylene.Change Method needs to add chemical assistant, and cost improves, and in degradation process, can produce substantial amounts of corrosivity or have poison gas Body, easily cause secondary pollution, therefore chemical method is not a kind of effective method of environmental protection.

Physical method is to be added without chemical substance, just with external energy, divides the long-chain of ultra-high molecular weight polyethylene Subchain rupture failure, the polyethylene of the low relative molecular weight of short chain is formed, there is shear at high temperature mobility and machinability and obtain With regeneration.Currently used is the method for microwave or ultrasonic wave, although physical method due to the addition of no chemical substance, Secondary pollution will not be caused, it is relatively environment-friendly, but the equipment investment of these methods is big, is difficult to realize continuous production, therefore efficiency It is very low, it is difficult to realize in large-scale industrial production field, rests on laboratory stage mostly.

For existing recovery ultra-high molecular weight polyethylene or common polythene discarded object containing ultra-high molecular weight polyethylene Method problem encountered is, it is necessary to study the new recovery and treatment method of efficient non-secondary pollution.

The content of the invention

The present invention provides a kind of degraded recovery ultra-high molecular weight polyethylene discarded object or contains ultra-high molecular weight polyethylene The new method of conventional polyvinyl discarded object, can degrade ultra-high molecular weight polyethylene with environment-friendly high-efficiency so that the poly- second after degraded Alkene waste material has shear at high temperature mobility and machinability, can be granulated by Screw Extrusion, directly apply to downstream Production of articles, solve the pollution of traditional treatment method and low efficiency problem.

A kind of recovery process of ultra-high molecular weight polyethylene discarded object, step are as follows:

Ultra-high molecular weight polyethylene discarded object after crushed, adds extruder, under high temperature and alternating shear effect so that Chain rupture occurs for the strand of ultra-high molecular weight polyethylene, realizes and recycles;

The extrusion temperature of the extruder is 240~300 DEG C, and die pressure is 3~20MPa;

The draw ratio of the extruder screw is 56~80, and screw speed is 400~1200rpm so that what material was born Cutter shearing line speed>4m/s;

The cutter shearing line speed that described material is born also refers to the linear velocity of screw rod end;

It is 2~10 that the screw combinations of the extruder, which keep the alternating cycles of shearing force,;

The processing time of the material>30s, when the processing time of material refers to that material bears the effect of high temperature Strong shear Between;

Described extruder is single screw extrusion machine or double screw extruder.

Preferably, described extruder is double screw extruder;More preferably parallel dual-screw extruding machine.

Described ultra-high molecular weight polyethylene discarded object needs first to be crushed to 2~4cm bulk or tablet, adds crowded Go out in machine.

Preferably, the extrusion temperature of the extruder is 260~300 DEG C, die pressure is 15~20MPa.Further It is preferred that the draw ratio of the extruder screw is 72~80, screw speed is 500~1200rpm.Further preferably, the extruder Screw combinations keep shearing force alternating cycles be 6~10.

It is further preferred that the extrusion temperature of the extruder is 260~280 DEG C, die pressure is 15~20MPa, the length of screw rod Footpath ratio is 72~80, and screw speed is 500~600rpm, and it is 6~8 that screw combinations, which keep the alternating cycles of shearing force,.Using Above-mentioned preferable expressing technique, the degraded of ultra-high molecular weight polyethylene can be fast and efficiently realized, and the performance after regeneration is excellent It is different.

The present invention general principle be:Under high temperature and the effect of alternation Strong shear, pass through physical action supra polymer Degraded chain rupture occurs for the molecule long-chain of weight northylen, is changed into short chain polyethylene molecule, destroys its complicated long-chain and mutually wind knot Structure, so as to realize that the high efficiente callback of ultra-high molecular weight polyethylene discarded object utilizes.Its basic technology is:(1) treatment temperature:240 DEG C~300 DEG C;(2) it is to realize Strong shear, the cutter shearing line speed that material is born>4m/s;(3) processing time of material>30s;(4) The alternating cycles for the Strong shear power that material is born are 2~10.In industrial processes, what can be designed by special construction is in the same direction double Screw extruder, counter rotation twin screw extruder or single screw extrusion machine continuous production, the special construction requirement for extruder are: Extruder length diameter ratio is:56~80, it is 2~10 that screw combinations, which keep the alternating cycles of shearing force,.And for extruder Basic processing technology be:1) heating-up temperature:240 DEG C~300 DEG C;(2) screw speed:400~1200rpm;(3) die pressure 3~20MPa.Recycling for ultra-high molecular weight polyethylene discarded object can be realized by this method, both protect environment, moreover it is possible to create Make huge economic benefit.

The heating-up temperature of above-mentioned extruder in the present invention, it is the maximum temperature that extruder is set.

The present invention will be elaborated below.

Present patent application is to recycle ultra-high molecular weight polyethylene discarded object or containing super high molecular weight with environment-friendly high-efficiency For the purpose of the discarded object of polyethylene, artificial this of patented invention has made extensive and intensive studies.For the disconnected of long-chain polymer Chain depolymerization mechanism and the method for existing recovery ultra-high molecular weight polyethylene discarded object, how environment-friendly high-efficiency rate realization of industrialization is carried out Exploratory development.

Ultra-high molecular weight polyethylene is because molecular weight is big, molecular chain length, and the mutual winding of complexity is formd between strand Network structure, cause the sliding of molecule interchain difficult, therefore ultra-high molecular weight polyethylene is macroscopically being presented without high temperature Shear flow, and be difficult to by screw extruder molding, granulating.Its discarded object can not the melting of threaded extruder again plus Work is correspondingly lost recovery value into product.The recovery value of ultra-high molecular weight polyethylene is realized, destroys its complexity The network structure that strand is mutually wound is crucial, and processing for its shear at high temperature could be realized by forming the low winding arrangement of short chain Property.

The network structure that the strand of ultra-high molecular weight polyethylene is mutually wound is destroyed, actually molecular chain degradation is become Short, correspondingly its winding arrangement is also destroyed.Actually need to destroy some of which carbon-carbon bond so that long-chain becomes short chain. According to the thermodynamic argument of chemical bond, destroying carbon-carbon bond needs to provide enough energy, i.e., the extraneous energy provided is more than carbon The molecular bond energy of carbon key.The energy needed for destruction carbon-carbon bond generally is provided by two methods, one kind is chemical method, is passed through Attack of the chemical substance to carbon-carbon bond, the bond energy of carbon-carbon bond is reduced, be broken and depolymerization so that chemical bond absorbs energy, At present, chemical method is not also that very effectively, that is, being not easily found very suitable chemical substance can be with to ultra-high molecular weight polyethylene Destruction is efficiently produced to carbon-carbon bond, and the chemical method reported is then inefficient, and during can produce corruption Corrosion or toxic gas, produce secondary pollution, therefore presently, chemical method degraded ultra-high molecular weight polyethylene also not into It is ripe, also not environmentally.Another kind is physical method, and it mainly provides heat to long-chain polymer, passes through microwave or ultrasonic wave Method provides heat to material, and when heat is more than the bond energy of carbon-carbon bond, chemical bond is destroyed and molecule chain break drop occurs Solution.Although physical method will not cause secondary pollution, relatively environment-friendly, the equipment of these methods without the addition of chemical substance Investment is big, is difficult to realize continuous production, therefore efficiency is very low, is difficult to realize in large-scale industrial production field, stops mostly Stay in laboratory stage.

Therefore the method for existing degraded ultra-high molecular weight polyethylene is also immature, in order to realize the recovery of high-efficiency environment friendly, For this, inventor herein is by further investigation, it is proposed that new degradation principles:Under high temperature and the effect of alternation Strong shear, pass through Physical action causes the strand of ultra-high molecular weight polyethylene to degrade, so as to realize that superhigh molecular weight polyethylene material is discarded The high efficiente callback of thing or polymer waste containing ultra-high molecular weight polyethylene utilizes.

First, physical method is most environmentally friendly method, but how the key of physical method is efficiently to super high molecular weight Polyethylene provides enough energy to destroy carbon-carbon bond.Heat is provided material, and basic mode includes heat transfer, and (heater supplies Heat), heat radiation (ultrasonic wave or microwave), heat radiation needs special equipment, expensive, dimension-limited, therefore and uneconomical Efficiently, and heat exchange pattern is influenceed by heat source temperature, the thermal conductivity factor of material, viscosity and flow regime etc. are many, efficiency It is relatively low, and be difficult to so that material uniformly and the accurate temperature of control is more difficult, or the heat provided is not enough to destroy carbon Carbon cross-bond, decomposed or part is too high, become low molecular weight substance or even carbonize to black and lose the property as material Energy.Therefore a kind of high temperature recovery method be present in the recycling field of ultra-high molecular weight polyethylene, i.e., these non-fusants are made depth Cracking oil refining, ultra-high molecular weight polyethylene is changed into by the method for high-temperature heating the fluid organic material of low-carbon, but this method Efficiency is very low, and conversion ratio is not high, and by-product largely abandoned by the intractable three wastes, current this method, therefore only The recycling of high-efficiency environment friendly can't be realized by heat exchange pattern.

, can also be by way of shearing so that carbon carbon in addition to causing carbon-carbon bond to super long-chain polymer heat supply and destroying The shearing force that key is subject to exceedes the chemical bond power of carbon-carbon bond.Shearing force is a kind of macroscopical active force, and chemical bond power It is to connect the active force between atom, is a kind of micro force, is that can destroy carbon-carbon bond by effective shear action, But there is several factors that need to consider:First, how the shearing force enough to material, and effectively it is this macroscopic view act on masterpiece With on microcosmic atom, this is crucial.Secondly, only go to destroy carbon carbon chemical bond and may also be insufficient to by shearing force, can be with Material energy is given by way of heat transfer, auxiliary shearing force goes to destroy cross-bond.3rd, we recycle super high molecular weight Polyethylene, it is desirable to which material has shear at high temperature mobility, while also to have the performance of material, that is, is unable in saboteur's structure All chemical bonds, molecular weight is set not reduce too much, therefore how effectively to control the effect of shearing force is also to need to consider 's.Based on this understanding, by research, we have proposed the general principle of degraded recovery ultra-high molecular weight polyethylene:Utilize high temperature Under being acted on alternation Strong shear, degraded chain rupture is occurred by the strand of physical action ultra-high molecular weight polyethylene, so as to Realize the recycling of superhigh molecular weight polyethylene material discarded object.

Found by further technical study, it is required to realize effective degraded chain rupture of ultra-high molecular weight polyethylene Basic technology is:(1) treatment temperature:240~300 DEG C;(2) it is to realize Strong shear, the cutter shearing line speed that material is born>4m/s; (3) processing time of material>30s;(4) alternating cycles for the Strong shear power that material is born are 2~10.Heat, carry to material For certain energy, destruction of the auxiliary shearing force to cross-bond, it is possible to reduce the effect of shearing force, according to superhigh molecular weight polyethylene The characteristics of alkene, in the range of 240~300 DEG C, the problem of scission of link decomposes, and the carbon carbon in long-chain molecule chain will not occur for material The reduction of winding degree can make it that after key fracture, strand produces sliding at temperature and shear action and has mobility, has Beneficial to direct screw rod granulating and forming.And shearing force refers in action material, make the cross section of material that the effect of the relative changing of the relative positions occur Power, it is the force object by rotation to be commonly applied shearing force, and shearing force, shearing force are produced to material by the rotation of high speed Size can be weighed by the end linear velocity for the object that exerts a force, by research find, the cutter shearing line speed that material is born must It must meet>4m/s, do so the active force that carbon-carbon bond could be destroyed with the shearing force on material so that chain rupture occurs.In order to So that the polyethylene after degraded has temperature flowing and enough mechanical properties, it is necessary to so that the complicated netted knot being wound More than the 50% of structure destroys, and its molecular weight needs to be degraded to less than 1,000,000, reaches this palliating degradation degree, the high temperature that material is born Strong shear action time needs>30s.In order to control chain rupture degree, the mechanical strength after ultra-high molecular weight polyethylene degraded is kept, I.e. molecular weight can not be too high, can not be too low, therefore we use alternation formula shear action mode, the degraded controlled as needed Degree, the alternating cycles that material is born are 2~10.

For above-mentioned technological requirement, to realize that industrial high efficiency produces, the parallel dual-screw of special construction design may be selected Extruder, counter rotation twin screw extruder or single screw extrusion machine continuous production.Extruder is a kind of ripe device of plastic processing, Temperature can be provided to material by heating, and the rotation of the high speed of screw rod can produce Strong shear and act on material, be enclosed on screw rod On element can be prepared into the flow guiding unit of various types and carry out independent assortment, efficiently control conveying of the material in barrel And mixing, and according to the general principle of the inventive method, combined by different screw units, it is convenient to control alternating shear Cycle.For single screw extrusion machine, its shearing force is the relative velocity between the screw rod by rotating and static barrel wall and produced Raw, and double screw extruder, shearing force then comes between two screw rods and the rotary motion between screw rod and barrel, therefore For the method for the present invention, it can both be realized, can also be realized by double screw extruder by single screw extrusion machine, and from The action effect of shearing force sees that double screw extruder effect is more preferable, and parallel dual-screw is preferred.

For extruder, the size of shearing force in addition to the fundamental type of screw rod, also with screw speed and screw diameter phase Close, screw speed is faster, and shearing force is stronger, and screw diameter is bigger, and shearing force is also bigger, but the speed of rotating speed is by drive screw rod The power of the motor of rotation and the intensity of screw rod determine that the rotating speed of screw rod is faster, because ultra-high molecular weight polyethylene is in screw rod In high viscosity and high coagulant state, viscosity is very big, and high rotating speed needs bigger power of motor, while screw rod is providing material sufficiently large shearing While power, big shearing force itself is also born, therefore high requirement is proposed to the intensity of screw rod.

For parallel dual-screw, to meet foregoing technological requirement, then its special structural requirement is:Extruder length is straight Footpath ratio is:56~80, it is 2~10 that screw combinations, which keep the alternating cycles of shearing force,.And in degraded ultra-high molecular weight polyethylene During material, the process conditions of extruder are arranged to:1) heating-up temperature:240 DEG C~300 DEG C;(2) screw speed:400~ 1200rpm;(3) 3~20MPa of die pressure.

Pass through the technique, it is possible to achieve the degraded to ultra-high molecular weight polyethylene discarded object recycles, it is evident that passes through Conventional method, in double screw extruder, material is not due to having shear flow, it is impossible to is extruded into strip and realizes granulation.And By the method for the present invention, same material, effective degraded, the fusible stream of material are carried out to ultra-high molecular weight polyethylene It is dynamic, it can be granulated again, mechanics of materials intensity is high.

Compared with prior art, the invention has the advantages that:

The technique of degraded recovery ultra-high molecular weight polyethylene discarded object provided by the invention, utilizes high temperature and alternation Strong shear Active force, it can realize that continuous degradation is granulated in an extruder, because degradation process does not have the effect of chemical substance, also not produce " three wastes ", recycle ultra-high molecular weight polyethylene and the polymerization containing ultra-high molecular weight polyethylene so as to high-efficiency environment friendly Thing waste material, can environmental protection, economize on resources, and can improves ultra-high molecular weight polyethylene discarded object or containing supra polymer The value of the discarded object of weight northylen, huge economic benefit can be created.

Embodiment

Embodiment 1

High molecular weight polyethylene board material discarded object is crushed to by pulverizer the bulk or tablet of 2~4cm sizes, Using the parallel dual-screw extruding machine of particular arrangement, the basic configuration of extruder is:Screw diameter D=65mm, draw ratio L/D= 72, power of motor P=120KW, screw combinations are arranged to 8 alternating shear power cycles.Extruder fabrication process condition is:Most High-temperature is 280 DEG C, screw speed 600rpm, die pressure 15MPa.Ultra-high molecular weight polyethylene is degraded by extruder, It can be achieved to be granulated, material properties is as shown in table 1 before and after granulation.

Table 1

Performance parameter Before degraded After degraded Weight average molecular weight (ten thousand) 350 65 Melt index (190 DEG C of 2.16Kg of g/10min@) Do not flow 1.0 Tensile strength (MPa) - 20.6 Elongation at break (%) 340

Embodiment 2

Material, equipment and processing technology are same as Example 1, and processing temperature highest is arranged to 260 DEG C.Super high molecular weight is gathered Ethene can be granulated by double screw extruder, and the performance parameter of material is shown in Table 2.

Table 2

Performance parameter Before degraded After degraded Weight average molecular weight (ten thousand) 350 83 Melt index (190 DEG C of 2.16Kg of g/10min@) Do not flow 0.6 Tensile strength (MPa) - 15.2 Elongation at break (%) 190

Embodiment 3

Material, equipment and processing technology are same as Example 1, and screw speed is arranged to 500rpm.Superhigh molecular weight polyethylene Alkene can be granulated by double screw extruder, and the performance parameter of material is shown in Table 3.

Table 3

Performance parameter Before degraded After degraded Weight average molecular weight (ten thousand) 350 92 Melt index (190 DEG C of 2.16Kg of g/10min@) Do not flow 0.1 Tensile strength (MPa) - 13.7 Elongation at break (%) 150

Embodiment 4

Material, equipment and processing technology are same as Example 1, and screw combinations are arranged to 6 alternating shear power cycles.Superelevation Molecular weight polyethylene can be granulated by double screw extruder, and the performance parameter of material is shown in Table 4.

Table 4

Performance parameter Before degraded After degraded Weight average molecular weight (ten thousand) 350 75 Melt index (190 DEG C of 2.16Kg of g/10min@) Do not flow 0.8 Tensile strength (MPa) - 21.4 Elongation at break (%) 350

Embodiment 5

Equipment and processing technology are same as Example 1, material be 50% high molecular weight polyethylene board material discarded object and 50% HDPE discarded object mixtures.It can be granulated by double screw extruder, the performance parameter of material is shown in Table 5.

Table 5

Performance parameter Before degraded After degraded Weight average molecular weight (ten thousand) - - Melt index (190 DEG C of 2.16Kg of g/10min@) Do not flow 4.5 Tensile strength (MPa) - 25.6 Elongation at break (%) 600

Comparative example 1

Material, equipment and processing technology are same as Example 1, and screw speed is arranged to 300rpm.Superhigh molecular weight polyethylene Alkene can not be granulated by double screw extruder, and the performance parameter of material is shown in Table 6.

Table 6

Performance parameter Before degraded After degraded Weight average molecular weight (ten thousand) 350 320 Melt index (190 DEG C of 2.16Kg of g/10min@) Do not flow Do not flow Tensile strength (MPa) - - Elongation at break (%) - -

Comparative example 2

Material, equipment and processing technology are same as Example 1, and processing temperature highest is arranged to 220 DEG C.Super high molecular weight is gathered Ethene can not be granulated by double screw extruder, and the performance parameter of material is shown in Table 7.

Table 7

Performance parameter Before degraded After degraded Weight average molecular weight (ten thousand) 350 330 Melt index (190 DEG C of 2.16Kg of g/10min@) Do not flow Do not flow Tensile strength (MPa) - - Elongation at break (%) - -

Comparative example 3

Material, equipment and processing technology are same as Example 1, and screw combinations are arranged to 1 alternating shear power cycle.Superelevation Molecular weight polyethylene can not be granulated by double screw extruder, and the performance parameter of material is shown in Table 8.

Table 8

Performance parameter Before depolymerization After depolymerization Weight average molecular weight (ten thousand) 350 330 Melt index (190 DEG C of 2.16Kg of g/10min@) Do not flow Do not flow Tensile strength (MPa) - - Elongation at break (%) - -

Comparative example 4

Using co-rotating twin-screw extruder, the basic configuration of extruder is:Screw diameter D=35mm, draw ratio L/D =48, power of motor P=35KW, screw combinations conventional arrangement.Extruder fabrication process condition is:Maximum temperature is 280 DEG C, Screw speed is 400rpm, die pressure 12MPa.Ultra-high molecular weight polyethylene can not be granulated by double screw extruder, material Performance parameter be shown in Table 9.

Table 9

Performance parameter Before degraded After degraded Weight average molecular weight (ten thousand) 350 350 Melt index (190 DEG C of 2.16Kg of g/10min@) Do not flow Do not flow Tensile strength (MPa) - - Elongation at break (%) - -

Claims (6)

1. a kind of recovery process of ultra-high molecular weight polyethylene discarded object, it is characterised in that step is as follows:
Ultra-high molecular weight polyethylene discarded object after crushed, adds extruder, under high temperature and alternating shear effect so that superelevation Chain rupture occurs for the strand of molecular weight polyethylene, realizes and recycles;
The extrusion temperature of the extruder is 240~300 DEG C;
The draw ratio of the extruder screw is 56~80, and screw speed is 400~1200rpm so that the shearing that material is born Linear velocity>4m/s;
It is 2~10 that the screw combinations of the extruder, which keep the alternating cycles of shearing force,;
The processing time of the material>30s;
Described extruder is parallel dual-screw extruding machine.
2. the recovery process of ultra-high molecular weight polyethylene discarded object according to claim 1, it is characterised in that described is super High molecular weight polyethylene discarded object is crushed to 2~4cm bulk or tablet.
3. the recovery process of ultra-high molecular weight polyethylene discarded object according to claim 1, it is characterised in that the extrusion The extrusion temperature of machine is 260~300 DEG C, and die pressure is 15~20MPa.
4. the recovery process of ultra-high molecular weight polyethylene discarded object according to claim 3, it is characterised in that the extrusion The draw ratio of machine screw rod is 72~80, and screw speed is 500~1200rpm.
5. the recovery process of ultra-high molecular weight polyethylene discarded object according to claim 4, it is characterised in that the extrusion It is 6~10 that the screw combinations of machine, which keep the alternating cycles of shearing force,.
6. the recovery process of ultra-high molecular weight polyethylene discarded object according to claim 5, it is characterised in that the extrusion The extrusion temperature of machine is 260~280 DEG C, and die pressure is 15~20MPa, and the draw ratio of screw rod is 72~80, and screw speed is 500~600rpm, it is 6~8 that screw combinations, which keep the alternating cycles of shearing force,.
CN201510433400.6A 2015-07-22 2015-07-22 A kind of recovery process of ultra-high molecular weight polyethylene discarded object CN105061806B (en)

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CN106432791A (en) * 2016-08-08 2017-02-22 桂林市春晓环保科技有限公司 Recovery process of polyethylene waste
CN106279753A (en) * 2016-08-11 2017-01-04 桂林市春晓环保科技有限公司 A kind of recovery process of waste and old crosslinked polypropylene
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CN107828171A (en) * 2017-10-20 2018-03-23 成都新柯力化工科技有限公司 A kind of method of block polymerization reclaiming plastics

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